On Sat, 30 Aug 2008, Ross wrote: > while the problem is diagnosed. - With that said, could the write > timeout default to on when you have a slog device? After all, the > data is safely committed to the slog, and should remain there until > it's written to all devices. Bob, you seemed the most concerned > about writes, would that be enough redundancy for you to be happy to > have this on by default? If not, I'd still be ok having it off by > default, we could maybe just include it in the evil tuning guide > suggesting that this could be turned on by anybody who has a > separate slog device.
It is my impression that the slog device is only used for synchronous writes. Depending on the system, this could be just a small fraction of the writes. In my opinion, ZFS's primary goal is to avoid data loss, or consumption of wrong data. Availability is a lesser goal. If someone really needs maximum availability then they can go to triple mirroring or some other maximally redundant scheme. ZFS should to its best to continue moving forward as long as some level of redundancy exists. There could be an option to allow moving forward with no redundancy at all. Bob ====================================== Bob Friesenhahn [EMAIL PROTECTED], http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer, http://www.GraphicsMagick.org/ _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
